Flywheel integrity

K.O. SWINGER said

I understand the dangers of an exploding flywheel but in 40 years of Street racing I have only seen one flywheel come apart and actually I was very young and I believe it was a fastener problem and not the flywheel actually failing also thousands and thousands of iron flywheels have been used over the years

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Those weren’t 40 or 50 years old then either. It also depends on the clutch you run. If you are generating a lot of heat you need something better.

Like I said above, most anything today needs an aluminum flywheel. All that mass (lets say 30 pounds) that far away from the centerline of the crank imparts a huge amount of shock to the drivetrain/chassis/tire and unless you need that (you do if you have a very small displacement, heavy car or both) you’ll just beat the crap out of the tire and make it harder to tune the chassis.